JP4339759B2 - Protective film for plant cultivation and method for producing the same - Google Patents

Description

  The present invention relates to a protective film for plant cultivation and a method for producing the same.

  In general, when cultivating plants such as cigarettes, for the purpose of keeping warm, as shown in FIG. 6, a cover film provided with a through hole is covered with a cocoon and plant seedlings are planted at the position of the through hole. It has been broken. However, this method has the disadvantage that the seedlings are exposed to wind and rain and frost, and the growth is not as expected.

  Various proposals have been made in order to eliminate these drawbacks. For example, it is proposed that a protective film having an adhesive layer provided on the side edge is further covered on the cover film to protect the plant. ing.

  However, when the protective film is used, it is necessary to remove the protective film when the seedling has grown to some extent. Usually, since the protective film is attached to the cover film with an adhesive, it was necessary to remove the protective film by peeling it off from the adhesive layer or by removing the protective film. However, in the above method, the protective film cannot be removed smoothly, requiring a large force, the direction of the break meandering to correct the meandering, or bending down to remove the remaining part, etc. It was necessary to work in an unreasonable posture, and not only the physical burden on the worker was great, but also the work efficiency was very bad.

  Therefore, in order not to inhibit the growth of the plant, a fold portion is provided in the width direction of the protective film, and the film is easily removed near the boundary between the side end portion provided with the adhesive layer of the film and the film body. It has been proposed to provide a perforation or a streak-shaped recess along the same (Patent Document 1).

JP 07-1111834 A

  However, the protective film does not break cleanly along the perforations or recesses when removing, and since the protective film is soft, the way of applying force to the breaking point is not constant when removing, so the breaking direction is meandering I found it easy to do. In other words, for films with perforations and streak-like recesses, the above disadvantages can be solved completely by increasing the perforations or reducing the film thickness at the recesses. Will drop and break during handling. In order to maintain the strength that does not break during handling, it has been found that the perforation size and the film thickness of the recesses are limited and the above disadvantages are not sufficiently solved.

As a result of various investigations on the ease of removal, the present inventors have not always provided perforations or streak-like recesses in the film in order to break the film easily during film removal, and the strength of the film partially. The present inventors have found that the above-mentioned drawbacks can be solved and the film can be easily removed if the fracture can be linearly broken without meandering at the time of breaking without lowering the thickness.
That is, an object of the present invention is to provide a protective film for plant cultivation that can be easily removed when not needed, and a method for producing the protective film, without causing a decrease in strength of the film.

  The invention described in claim 1 is a protective film for plant cultivation in which an adhesive layer is provided in the vicinity of both ends in the width direction of the long plastic film and a reinforcing layer is provided inside the adhesive layer.

  Invention of Claim 2 is a protective film for plant cultivation of Claim 1 in which the folding part is formed in the width direction of a long plastic film.

  Invention of Claim 3 is laminated | stacked on a protective film, supplying an adhesive layer material and a reinforcement layer material simultaneously from one supply apparatus, winding up a long plastic film. It is a manufacturing method of a protective film.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway perspective view showing an example of a protective film for plant cultivation of the present invention. In the figure, reference numeral 1 denotes a protective film for plant cultivation, in which an adhesive layer 12 is provided at both ends of the long plastic film 11 in the width direction, and a reinforcing layer 13 is provided inside thereof.

  The long plastic film 11 has a folding portion 14 formed in the width direction and a plurality of small holes 15, 15.

  FIG. 2 is an explanatory view showing the laminated state of the adhesive layer (the reinforcing layer is omitted), and the adhesive layer 12 protrudes outwardly from the upper surface of the long plastic film 11 as shown in FIG. The adhesive layer may be provided on the lower side, or may be provided on the lower surface of the long plastic film 11 as shown in FIG. In the case of FIG. 2 (a), it sticks to a cover film in the part protruded to the outward of the adhesion layer, and in the case of FIG. 2 (b), it sticks to the cover film with the whole adhesion layer. In general, a separator film is laminated on the adhesive layer so that the adhesive layer is protected or unwound by the adhesive layer when it is rolled, but in the present invention, a separator is provided. However, since the long plastic film serves as a separator, the separator may not be provided. By not providing the separator, it is not necessary to remove the separator at the time of construction described later, so that the operation becomes easy, and further, it becomes economically advantageous.

The pressure-sensitive adhesive layer is not particularly limited, and for example, a pressure-sensitive adhesive tape may be used, or a pressure-sensitive adhesive may be directly laminated on the plastic film 11. Used.
As the pressure-sensitive adhesive tape, any conventionally known pressure-sensitive adhesive tape can be used. For example, a rubber-based pressure-sensitive adhesive or an acrylic pressure-sensitive adhesive is provided on one surface of a base film such as a vinyl chloride resin film, an ethylene resin film, a propylene resin film, or a polyester film. And an adhesive tape in which an adhesive such as an adhesive, a silicone-based adhesive, and a urethane-based adhesive is laminated.

  It does not specifically limit as an adhesive directly laminated | stacked, The adhesive used for the said adhesive tape may be used.

As the reinforcing layer provided inside the adhesive layer, other films are laminated on a long plastic film, or when the adhesive tape is laminated to break the film, the breaking direction meanders. It is only necessary to provide a layer with improved strength to the extent that it is prevented from breaking in the width direction.
The thickness, width, and strength of the reinforcing layer are not particularly limited, and when the film of the present invention is removed, the reinforcing effect is such that the film is not broken between the adhesive layer and the reinforcing layer and causes meandering. I just need it. In general, the thickness is preferably 10 μm or more, and the width is preferably 3 mm or more.
The gap between the adhesive layer and the reinforcing layer is not particularly limited as long as the film can be broken between the adhesive layer and the reinforcing layer to prevent meandering when the film of the present invention is removed. 0.5-10 mm is preferable from the easiness, the ease of manufacture, etc.

The reinforcing layer may be provided on the same side as the adhesive layer of the long plastic film, or may be provided on the opposite side. From the viewpoint of ease of tearing at the time of removal, ease of manufacture, etc. It is preferable to be provided on the same side surface.
The method for providing the reinforcing layer is not particularly limited. For example, the above-mentioned adhesive tape may be laminated, or another film may be laminated using an adhesive or an adhesive. It is preferable to provide a reinforcing layer by laminating an adhesive at the same time when the adhesive layer is provided because of ease of production. The adhesive layer and the reinforcing layer may be the same adhesive tape or different adhesive tapes.

  The material of the plastic film 11 may be any plastic that is generally used as an agricultural film. For example, polyvinyl chloride resin, polyethylene resin (particularly high-density polyethylene resin), polypropylene resin, ethylene-vinyl acetate copolymer Examples include coalescence.

  The plastic film 11 is preferably transparent to sunlight for growing seedlings, and is preferably transparent and translucent. The color may be appropriately determined such as colorless, red, blue, yellow, and the like, but blue is preferable because of its excellent heat retention effect, dew prevention effect, leaf burn prevention effect, and the like.

  The thickness of the plastic film 11 may be appropriately determined as necessary, but is generally 5 to 40 μm, preferably 10 to 15 μm.

  The plastic film 11 includes an anti-fogging agent, an antioxidant, an ultraviolet absorber, a light stabilizer, an anti-blocking agent, an anti-fogging agent, an anti-rust agent, a plasticizer, an inorganic filler, and the like as necessary. It may be added.

Although it does not specifically limit as a method to manufacture the protective film of this invention, The example which uses an adhesive tape as an adhesive layer and a material for reinforcement | strengthening layers is demonstrated using FIG. 3, FIG.
FIG. 3 is a schematic view of the whole, and FIG. 4 is a schematic view of an adhesive tape supply device.
In FIG. 3, the long film 11 is continuously supplied from a roll, and the pressure-sensitive adhesive tape that forms the pressure-sensitive adhesive layer 12 and the reinforcing layer 13 is laminated on both ends of the film by the pressure roll 21 and wound as a protective film. At this time, the adhesive tape forming the adhesive layer 12 and the reinforcing layer 13 on one side is supplied from one adhesive tape supply device 22. As shown in FIG. 4, the adhesive tape supply device has two grooves, and the adhesive tape forming each layer is loaded into the groove portion of the adhesive tape supply device and continuously supplied.

  FIG. 5 is an explanatory view showing a use state of the protective film. As shown in FIG. 5A, seedlings 3 are planted in the cocoon 2. Reference numeral 4 denotes a cover film made of a plastic film such as vinyl chloride resin, ethylene resin or propylene resin.

  Reference numeral 1 denotes a protective film of the present invention, which is attached to the cover film 4 by pressing the adhesive tapes 12 and 12 at both ends against the cover film 4. The method for attaching the protective film to the cover film is not particularly limited, and the adhesive film formed on both ends of the protective film is attached to the cover film by pressing. For example, it may be affixed by the method etc. which are described in Unexamined-Japanese-Patent No. 07-1111834.

Thus, by covering the seedling 3 with the cover film 4 and the protective film 1, it is possible to protect the tobacco seedling from wind and rain and frost damage as well as keeping warm.
Further, the protective film is provided with small holes, and air enters and exits through the small holes, so that the space in the protective film does not become an abnormally high temperature and prevents the growth of seedlings.

When the seedling 3 grows, as shown in FIG. 5B, the seedling 3 lifts the folding portion 14 of the protective film 1, and a tunnel-like space is formed by the protective film 1.
The growth of the seedling 3 is not inhibited by the space, but if the growth is further increased, the tip of the seedling 3 collides with the protective film 1 and the growth is inhibited, so the protective film 1 is between the adhesive layer and the reinforcing layer. Cut and removed. FIG.5 (c) shows the state from which the protective film was removed.

  The protective film for plant cultivation of the present invention is provided with an adhesive layer and a reinforcing layer in the length direction near the end of the film as described above, so that the strength of the film is not reduced and can be easily installed. Moreover, when it becomes unnecessary, it can be easily removed, and a large number of soot protective films can be removed simultaneously, so that workability is excellent. Furthermore, it is possible to protect and keep warm until a seedling grows to some extent by forming the folded portion. Moreover, the protective film for plant cultivation can be easily manufactured with the above-mentioned manufacturing method.

The embodiments of the present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.
(Example 1)
As shown in FIG. 1, a protective film (A) having an adhesive layer and a reinforcing layer provided on both ends of a polyethylene film (width 450 mm, thickness 10 μm) using an adhesive tape 15 mm wide (adhesion layer thickness 20 μm) was prepared. . Half of the adhesive layer protrudes outward, and the gap between the adhesive layer and the reinforcing layer is 2 mm.
(Comparative Example 1)
Using a 15 mm wide adhesive tape (adhesive layer thickness 20 μm) at both ends of a polyethylene film (width 450 mm, thickness 10 μm), the adhesive layer forms an adhesive layer with half protruding outwards, along the adhesive layer A protective film (B) was prepared by providing perforations with a cut length of 3 mm and an interval of 3 mm.
(Evaluation)
The protective films (A) and (B) obtained above were tested for actual tobacco cultivation. The protective film (A) of Example 1 was easily peeled off, and even when the five ridges were peeled simultaneously, the breaking direction did not meander and could be easily removed. On the other hand, when the protective film (B) of Comparative Example 1 was peeled off for one wrinkle, although the breaking direction sometimes meandered, it was able to be removed. The breaking direction meandered in a direction perpendicular to the ridges and could not be easily removed.

The partial cutaway perspective view which shows an example of the protective film of this invention. The typical explanatory view showing the position of the adhesion layer of the protection film of the present invention. The perspective view which shows typically the manufacturing method of the protective film of this invention. The figure which shows the supply apparatus of the adhesion layer of this invention, and the reinforcement layer forming material. Explanatory drawing which shows the use condition of the protective film of this invention. Explanatory drawing which shows the use condition of the conventional cover film.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Protective film 11 Long plastic film 12 Adhesive layer 13 Strengthening layer 14 Folding part 15 Small hole 21 Crimp roll 22 Adhesive tape supply apparatus

Claims (4)

Plant cultivation characterized in that an adhesive layer is provided in the vicinity of both ends in the width direction of the long plastic film, and a reinforcing layer having a width of 3 mm or more is formed inside the adhesive layer substantially in parallel with the adhesive layer. Protective film. The protective film for plant cultivation according to claim 1, wherein the adhesive layer and the reinforcing layer are made of the same adhesive tape. 3. The protective film for plant cultivation according to claim 1 or 2, wherein the long plastic film has a folded portion folded in the width direction in the longitudinal direction. A protective film for plant cultivation, characterized in that an adhesive layer is provided in the vicinity of both ends in the width direction of the long plastic film, and a reinforcing layer is formed on the inner side of the adhesive layer substantially parallel to the adhesive layer. The method is characterized in that, while winding a long plastic film made of a roll, the adhesive layer material and the reinforcing layer material are simultaneously supplied from one supply device and laminated on the film. The manufacturing method of the protective film for plant cultivation.

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